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Finding the Fourth Proportional to 98.03, 147.80 and 91.64

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Solution

The fourth proportional to 98.03, 147.80 and 91.64 is: 138.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    98.03 : 147.80 = 91.64 : x
  2. Step 2: Convert to fraction form
    98.03/147.80 = 91.64/x
  3. Step 3: Cross multiply
    98.03x = 147.80 × 91.64
  4. Step 4: Simplify right side
    98.03x = 13,544.99
  5. Step 5: Solve for x
    x = 13,544.99/98.03
  6. Step 6: Final answer
    x = 138.17

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.